Hm... if I may return to the early-game Dragon-types for just a moment... eh, that is a possibility, but of course any Ice-types other than especially versatile ones along the lines of Sneasel aren't particularly likely, either, unless the game really overhauled the old traditions and had you starting someplace with a very cold climate (much colder than just a little leftover snow in Twinleaf a la Platinum, I mean) instead of a happy little green town in the middle of the woods/plains. And dragons presumably wouldn't appreciate a climate like that, unless they were Ice/Dragon-types... not that that's a bad idea. (It would bork the Ice-weakness, of course, and defeat the point, but eh.)

Anyway. Looking at what little of the mystery 'mon we can see here (I'll just go ahead and link straight to PokéBeach's newest article in case anyone's missed it), I feel relatively confident saying that it's probably something mammalian. Reptilian Pokémon and the rest tend not to have such "fluffy-looking" bits on them. Of course, it could be a wing (though in my opinion the apparent angle and the fact that it's probably running on the ground alongside Pikachu makes that unlikely) or some sort of odd tail that I suppose could belong to anything, but... eh, I'm currently leaning towards Pikaclone for this one.

My two cents.